Xena and Battlestar Galactica star Lucy Lawless is joining the Agents of SHIELD. Who could she be?

Let's not forget that Marvel's Agents of SHIELD is a show about spies. A little mystery would do that show some good, wouldn't it? Well, this is a fine start. Lucy Lawless is joining the cast of Agents of SHIELD season two in an undisclosed role.

That's right. Undisclosed. This is some level seven stuff right here.

Hopefully, she'll be sticking around for more than a few episodes. Agents of SHIELD can use another veteran presence for Clark Gregg and Ming-Na Wen to play off of. We know they're looking for another semi-heroic character (some details on that here) to add a little life to the mix. But as for who Ms. Lawless could be playing? Well...we have two ideas that would be absolutely perfect right at the top of this list right here. Although if they decide to cast her as Jennifer Walters we wouldn't complain, either.

Agents of SHIELD season 2 will premiere on Tuesday, September 23rd at 9 pm EDT.